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We have a rideon mower with a hydro gear drive no. 328-0650 when it gets warm it will not drive uphill, we have changed the oil and put in the recommended 20W50 the problem is still there, we filled the box to about 4 inches from the top as we could not find anything to tell us how much oil to put in and there is no dipstick. We found on the internet how to prime it to expel any trapped air and the problem still exists. Can you help please?

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Hi taptac - - i have discovered that it should be filled to between 25.4 - 44.45mm. My pproblem is i dont know where to check the level or fill the thing ....!!!! i think that my actual filling nut has dissapeared - there is a hole in the casing on the top back right when looking from behind, which seems the only likely place . . . any ideas??

Posted on Oct 03, 2011


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Craftman model 917.258920 after cutting for a while the tractor moves slow when warm or will not move.

Looking at this breakdown part diagram for your hydro gear drive unit it has a filter, and hopefully a drain. Comparing it to a cold bottle of soda pop the moisture always goes to the warm side and puddles on the table but in this case it would be on the inside of your transaxle.So as the oil gets hot with repeated use it draws a little moisture every time,and more so if your plastic fan is broken. The 20w 50 oil polluted with water will foam up and fill your system with air which will not compress very well, like driving a nail with a rubber hammer. When you shut it off the air goes to the top of the oil and probably goes again until it foams again.My sugestion is to drain and change filter and refill with some 20w 50 motor oil. From personal experience it has fixed many slow hydros.PS: if the fan is broken or missing any blades it is a must to relace it and also run your RPMs on the engine all the way to generate enough air from that fan to cool the hydro unit.
http www searspartsdirect com model part 2183010 0529 1510000 10041130...

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Forward and reverse appear to be getting slower

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I put a new drive belt on my la 175 jonh ddeere mower but its still when it get hot

hydraulic transmission is going out. you may get some additional life out of it by changing the tranny oil.


The Huskvarna YTH150 uses Hydrogear transmission 319-0650, drive model 150071. One place to find parts and diagrams for most Huskvarnas is here:

MTDs use Hydrogear trannys also. Go to the site and enter 618-0319 in the search box. It will bring up a selection of MTD transmissions.

Sears Craftsmen mowers also have trannys from Hydro-Gear.

The best lawn tractor Hydrostatic Transmission Fluid is actually 10W-50 synthetic motor oil (like Mobil 1). Do not use hydraulic fluid or transmission fluid.

Hydro static transmissions on most lawn tractors are very similar. Most of them are made by one or two manufacturers. Tuff Torq makes a lot of them, but not the Huskvarnas. They do make all the John Deere lawn tractor hydro drives. The lawn tractor manufacturers (like JD) often say they are sealed and not serviceable. That is flat out, an untruth. All of the JD hydros, and most all others, are serviceable. A complete line of rebuild/replacement parts can be found at Tuff Torq. Info and instructions can be found there. They have a lot of good general info for anyone rebuilding their tranny.

Additionally, I have found that the mower manufacturers fill them (or spec them) with motor oil, 10W-30W. In the service manual, and at the hydro manufacturer, you are told if your tractor is used in extreme or heavy duty situations it's best to drain the oil and replace it with 10W-50 synthetic motor oil (like Mobil 1™). Truth is the tranny should have this oil from the get go. It will give you more power and extend the life of the tranny. The mower manufacturers are all just being cheap. They figure why not, you're the one who has to pay for the early failure. Oh yeah, one other minor detail, the tranny manufacturer also recommends regular oil changes, like every 100 hours.

Virtually all of these trannys have a black drain plug on the top, if they do not have the add on reservoir. You have to remove the tranny from the mower (not a difficult things to do, it takes about 30 min). Pull that black plug (I used a 1" putty knife to pry mine out) and turn the tranny upside down for about 30 min to completely drain. Most hold about 2 quarts. Flip it back, right side up, and refill. Install plug and reinstall tranny. Note: under the plug there is often a magnet which collects metal shavings. Lift this magnet out while you have the plug out; clean it and replace it. It may fall out while the tranny is upside down.If anything else falls out, you have a broken tranny and will have to take it apart.

When you refill the fluid just keep filling till it comes up within a quarter inch of the plug. You may have to go through a bleed process after reinstalling the tranny. The tuff torq site explains the bleed process.

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What weight of hydraulic fluid is used in a dixon lawn mower

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Slow reverse and slow uphill after warming up , does it need a new motion belt

If you are lucky it could be a belt slipping, so a new belt will cure this however as this happens when the machine warms up it could well be a hydro problem, as the oil in the hydro heats up it becomes more viscous so if there is wear in the hyro it will leak internally causing slow running.

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1 Answer

Viking Mt433T Rideon, backwheels do not drive just freewheels

hi there

is your machine a hydro unit ?

if so check that you have not left it in bypass mode ? there should be a rod or lever you push back in to disengage bypass

then check that the square 3/16 keys are in the wheel hubs if they use keys

if not check that the vee belt has tension on it and belt has not jumped off and the input pulley is turning on the top of the hydro box or gear box

if all is good could have a hydro or gear box fault

have a look and let me know

cheers pauly46

dont forget the thumbs rating

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1 Answer

Poula Pro Mower

Hi,your machine is probably a hydro static drive & needs the oil changed in the transmission.
But the pump that pushes the oil around inside it is probably to far gone for repair.
I am not sure about this machine but we have had a simlar problem with a rideon this summer.
It has one pedal that you push forward for forward movement & rearwards to go backwards.
We were able to get a new drive pump for the transmission but it was expensive, most of these machines have nearly the same transmissions so getting the parts should be no problem.
Also we do know is that there are some machines with oil emersed discs inside (like wet type clutches) these also need regular oil changes & can burn out without oil. (Bronze plated disc)
You would need to find the name plate on the transmission & there should also be model & serial no on the casing.
Once you have these details you should be able to find transmission parts lists online.

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